str1='nihao'
str2="nihao"
str3='''ni
hao'''
print(str1)
print(str2)
print(str3)
print('hel\'lo world')
print('123---{0}'.format(4))
print('123---{0}---{1}----{2}'.format(4,5,6))
str1='hello'
print(f'123---{str1}')

for i in range(0,101,2):
    print("========开始下载=======")
    if i==100:
        print("下载完成")
    else:
        str4="*"*(i//2)+"."*((100-i)//2)
        #print(f'{i}%','[',"*"*(i//2),"."*((100-i)//2),']')
        print(f'{i}%[{str4}]')
        